Dynamic rotor radial run-out value testing device and dynamic rotor radial run-out value testing method

Abstract

The invention discloses a dynamic rotor radial runout value testing device and method. The dynamic rotor radial runout value testing device comprises a base, a testing tool support arranged on the base, a supporting tool, a dynamometer and a laser displacement sensor installed on the testing tool support, and the dynamometer is connected with a motor rotor through the supporting tool. The method can solve the problem that the existing static test cannot comprehensively obtain the real run-out data of the rotor in a dynamic state, so that the evaluation of the operation stability of the rotor is not accurate enough, and the product performance and reliability are affected.

Description

Technical Field

[0001] This invention relates to the field of new energy motor measurement technology, specifically to a dynamic rotor radial runout testing device and method. Background Technology

[0002] In the field of rotating machinery, rotor radial runout is a key indicator for measuring the safety and stability of motor operation. Traditional radial runout testing methods mostly employ static measurements, which cannot accurately reflect the actual runout of the rotor under high-speed operation, and the measurement process is complex and inefficient. As motor design moves towards low-cost directions such as single-bearing and bearingless designs, the requirements for stator-rotor air gap design are becoming more stringent, leading to an increasing demand for the measurement and verification of dynamic rotor radial runout. In existing technologies, the measurement of dynamic rotor radial runout mainly relies on contact-based static measurement methods. Contact measurements typically use mechanical probes or sensors to directly contact the rotor surface. Although this method is low-cost, it is susceptible to mechanical wear and vibration interference, affecting measurement accuracy, and is not suitable for high-speed rotation scenarios. Long-term use may also lead to rotor surface damage.

[0003] Existing dynamic measurement devices often suffer from insufficient accuracy, slow response speed, and poor adaptability. Therefore, developing a test method capable of real-time and accurate measurement of rotor dynamic radial runout is of great significance for guiding the design of the air gap between the stator and rotor of motors. This invention aims to solve the above-mentioned technical problems and provide an efficient and accurate dynamic rotor radial runout testing scheme. Summary of the Invention

[0004] The purpose of this invention is to provide a dynamic rotor radial runout testing device and a dynamic rotor radial runout testing method. This device and method can solve the problem that existing static tests cannot fully obtain the real runout data of the rotor under dynamic conditions, resulting in inaccurate evaluation of rotor operation stability and affecting product performance and reliability.

[0005] To achieve this objective, the present invention provides a dynamic rotor radial runout testing device, comprising: a base, a testing fixture bracket, a support fixture, a dynamometer arranged on the base, a laser displacement sensor mounted on the testing fixture bracket, and the dynamometer being connected to the motor rotor via the support fixture.

[0006] Furthermore, the lower end of the test fixture bracket is a support part, and the upper end is a circular frame with a cavity. The test fixture bracket can move along the motor rotor axis through a moving slot.

[0007] Furthermore, there are multiple laser displacement sensors, which are evenly and symmetrically distributed along the circumference of the hollow circular frame at the upper end of the test fixture support.

[0008] Furthermore, the support fixture includes a support part and a connecting part, which are connected by a stop for positioning. The dynamometer is connected to the motor rotor by passing through the support part and the connecting part via a splined shaft.

[0009] Furthermore, the dynamometer is connected to the base via a dynamometer bracket.

[0010] Furthermore, a method for testing the dynamic rotor radial runout using the aforementioned device includes: A dynamometer is used to drive the motor rotor to rotate. Multiple laser displacement sensors are used to collect the instantaneous radial runout displacement signal of the motor rotor under dynamic conditions. The dynamometer also collects the instantaneous speed signal of the motor rotor under dynamic conditions. The preprocessed instantaneous speed signal of the motor rotor is resampled in the angle domain to obtain the angle domain signal corresponding to the instantaneous speed signal of the motor rotor. The order spectrum of the angle domain signal is calculated based on the angle domain signal corresponding to the instantaneous speed signal of the motor rotor to obtain the order spectrum of the motor rotor angle domain signal. Based on the order spectrum of the motor rotor angle domain signal and the preprocessed instantaneous speed signal of the motor rotor, a fitting curve of the motor's dynamic radial runout displacement changing with the speed is plotted.

[0011] Furthermore, the method for resampling the preprocessed instantaneous rotor speed signal in the angle domain to obtain the angle domain signal corresponding to the instantaneous rotor speed signal includes: calculating the instantaneous angle signal corresponding to the instantaneous rotor speed signal. θ(t) = ∫2π×RPM(t) / 60dt; Where θ(t) is the instantaneous angle signal corresponding to the instantaneous rotational speed signal of the motor rotor, and RPM(t) is the instantaneous rotational speed signal of the motor rotor.

[0012] Furthermore, the instantaneous angle signal θ(t) corresponding to the instantaneous rotational speed signal of the motor rotor is interpolated, and the instantaneous angle signal θ(t) corresponding to the instantaneous rotational speed signal of the motor rotor is aligned with the timestamps of the instantaneous radial runout displacement signals of the motor rotor collected by multiple laser displacement sensors to obtain the angle domain signal d(θ) corresponding to the instantaneous rotational speed signals of the motor rotor.

[0013] Furthermore, the method for calculating the order spectrum of the angle domain signal based on the angle domain signal corresponding to the instantaneous rotational speed signal of the motor rotor includes: performing Fourier transform on the angle domain signals d(θ) corresponding to multiple instantaneous rotational speed signals of the motor rotor to obtain multiple radial displacement order spectra with the order as the horizontal axis and the amplitude of the radial displacement of the motor rotor as the vertical axis; and vector superimposing the complex numbers of the same order to obtain the radial displacement order spectrum of the motor rotor.

[0014] Furthermore, the method for plotting the fitting curve of the dynamic radial runout displacement of the motor as a function of rotational speed based on the order spectrum of the motor rotor angle domain signal and the preprocessed instantaneous speed signal of the motor rotor includes: extracting the synchronous vibration component of the order spectrum of the motor rotor angle domain signal, plotting the fitting curve of the dynamic radial runout displacement of the motor as a function of rotational speed with the instantaneous speed or frequency of the motor as the abscissa and the amplitude or phase of the synchronous vibration component of the order spectrum of the angle domain signal as the ordinate.

[0015] The beneficial effects of this invention are as follows: By combining a highly sensitive displacement sensor with a high-precision optical measurement system, this invention can accurately capture extremely minute runout changes of a dynamic rotor during high-speed operation. In practical applications, the displacement sensor's accuracy can reach the micrometer level, enabling real-time monitoring of rotor radial runout. This provides precise data for motor design optimization and reduces risks such as stator / rotor rubbing and NVH (noise, vibration, and harshness). Simultaneously, an automated control system enables rapid and continuous measurement of rotor radial runout. In addition to radial runout, it can also simultaneously acquire multi-dimensional parameters such as rotor speed and vibration frequency. Comprehensive analysis of these parameters not only determines whether rotor runout is abnormal but also delves into the root causes of the runout, such as unbalanced mass distribution and shaft misalignment, providing a comprehensive basis for rotor structure design. This invention has good versatility; through simple tooling fixture changes, it can be adapted to different models and specifications of dynamic rotors. Whether it's a small electronic device rotor or a rotor in a large industrial device, it can perform accurate testing, effectively reducing the procurement cost of testing equipment. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the structure of an embodiment of the present invention; Figure 3 This is the Bode diagram of the present invention; Figure 4 This is a polar coordinate diagram of the present invention; Figure 5 This is a cascade diagram (waterfall diagram) of the present invention; Figure 6 This is a diagram of the axis trajectory of the present invention; Wherein, 1—base; 2—test fixture bracket; 3—motor rotor; 4—laser displacement sensor; 5—support fixture; 5.1—support part of support fixture; 5.2—connecting part of support fixture; 6—dynamometer; 7—dynamometer bracket; 8—splined shaft of fixture; 9—fixed plate. Detailed Implementation

[0017] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, not all of them. Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to represent selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0018] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments: Example 1 like Figure 1 The device shown is a dynamic rotor radial runout testing device, comprising: The base 1, the test fixture bracket 2, the motor rotor 3, the support fixture 5, the dynamometer 6 arranged on the base 1, the laser displacement sensor 4 installed on the test fixture bracket 2, and the dynamometer 6 connected to the motor rotor 3 through the support fixture 5.

[0019] In some technical solutions, the lower end of the test fixture bracket (2) is a support part, and the upper end is a circular frame with a cavity. The test fixture bracket 2 moves along the axial direction of the motor rotor 3 through the moving groove 8.

[0020] The upper end of the test fixture bracket 2 is a circular frame with a cavity. In some embodiments, the shape of the cavity includes circles and regular hexagons, as long as the cavity can completely accommodate the motor rotor 3. Generally, a circular cavity is the best choice because it is easy to process and saves materials. The support part at the lower end of the test fixture bracket 2 includes an "L"-shaped frame or other structures with a supporting function. The circular frame containing the cavity is used to set up multiple laser displacement sensors to measure the radial runout displacement of the motor rotor. At the same time, the hollow test fixture bracket 2 can translate along the axial position of the motor rotor 3 to measure the radial runout displacement at any end face of the motor rotor 3. The moving groove 8 is used to ensure the stability of the test fixture bracket 2 moving along the axial direction of the motor rotor 3.

[0021] In some technical solutions, there are multiple laser displacement sensors 4, which are evenly and symmetrically distributed along the circumference of the hollow circular frame at the upper end of the test fixture bracket 2.

[0022] Multiple laser displacement sensors 4 are evenly and symmetrically distributed along the circumference of the hollow circular frame at the upper end of the test fixture support 2, which can measure the radial runout displacement at multiple positions along the circumference of the cross-section of the motor rotor 3. In some embodiments, six laser displacement sensors can be configured.

[0023] In some technical solutions, the support fixture 5 includes a support part 5.1 and a connecting part 5.2. The support part 5.1 and the connecting part 5.2 are connected by a stop for positioning. The dynamometer 6 is connected to the motor rotor 3 by a spline shaft passing through the support part 5.1 and the connecting part 5.2.

[0024] The support portion 5.1 and the connecting portion 5.2 are used for stop positioning. In some embodiments, the support portion 5.1 and the connecting portion 5.2 are connected by bolts. The support portion 5.1 is used to support the motor rotor 3, and the connecting portion 5.2 is used to connect and fix the motor rotor 3, so that the motor rotor 3 can rotate stably.

[0025] In some technical solutions, the dynamometer 6 is connected to the base 1 via a dynamometer bracket 7. The dynamometer bracket 7 supports the dynamometer 6, enabling it to operate normally. The dynamometer is connected to a computer, and the speed of the dynamometer is controlled by testing software on the computer, which in turn drives the motor rotor to rotate.

[0026] Figure 2 In one embodiment of the device of the present invention, the dynamometer 5 is connected to the base 1 via the dynamometer bracket 7. One end of the dynamometer 5 is fixedly connected to the spline shaft 8 via a tooling shaft thread. The middle end of the spline shaft 8 is fixedly connected to the support part 5.1 of the support tooling via a thread. The other end of the spline shaft 8 is provided with an integrally connected fixing plate 9. The bearingless generator motor rotor 3 is installed on the fixing plate 9 via a thread. The fixing plate 9 is in close contact with the end face of the connection part 5.2 of the support tooling. Multiple laser displacement sensors are arranged on the test tooling bracket 2. The support tooling 5 is a double bearing support tooling, which is connected to the bearingless generator motor rotor 3.

[0027] A method for testing the dynamic rotor radial runout using the aforementioned device includes: The dynamometer drives the motor rotor to rotate, and multiple laser displacement sensors collect the instantaneous radial runout displacement signal of the motor rotor under dynamic conditions. The dynamometer also collects the instantaneous speed signal of the motor rotor under dynamic conditions. The preprocessed instantaneous speed signal of the motor rotor is resampled in the angle domain to obtain the angle domain signal corresponding to the instantaneous speed signal of the motor rotor. The order spectrum of the angle domain signal is calculated based on the angle domain signal corresponding to the instantaneous speed signal of the motor rotor to obtain the order spectrum of the motor rotor angle domain signal. The fitting curve of the dynamic radial runout displacement of the motor as a function of the speed is plotted based on the order spectrum of the motor rotor angle domain signal and the preprocessed instantaneous speed signal of the motor rotor.

[0028] Before using the device to measure the dynamic rotor radial runout, the displacement data of the motor rotor collected in a static state needs to be zeroed using measurement software.

[0029] Dynamic radial runout of a motor rotor refers to the change in radial displacement of its geometric center relative to the axis of rotation or a stationary reference point over time / rotational speed during rotation. It includes: Synchronous runout: a component related to the rotational speed frequency (1X) and its integer multiples (2X, 3X...). The most significant is usually the 1X component, caused by rotor mass imbalance; Asynchronous runout: a component not related to the rotational speed frequency (such as subsynchronous oil film whirl / oscillation, airflow excitation, electromagnetic force frequency, etc.).

[0030] The purpose of fitting the order spectrum of the motor rotor angle domain signal with the preprocessed instantaneous speed signal of the motor rotor to obtain the curve of the change of the motor's dynamic radial runout displacement with the speed is mainly to quantify the unbalanced response (i.e., the 1X component, radial runout caused by rotor mass imbalance), analyze the law of the motor rotor runout changing with the speed, provide a basis for the dynamic balance design of the motor rotor, and provide a basis for the design of the air gap between the motor stator and rotor.

[0031] The instantaneous radial runout displacement signal of the moving motor rotor is acquired by a laser displacement sensor. This signal represents the change of radial displacement in multiple directions along the circumference of the motor rotor's cross-section over time. The sampling rate needs to be much higher than the rotor speed frequency (usually at least 10 times the frequency of the highest order of interest) to avoid distortion of the acquired displacement signal. In some embodiments, the sampling rate of displacement acquisition can reach more than 1MHz. According to the sampling law, the analyzable frequency range is 1MHz / 2=500kHz. In this solution, the generator rotor (range extender) is connected to the engine, with a maximum operating speed of about 6000rpm (100Hz). The analyzable order is 500kHz / 100Hz=5000, with a focus on orders within the first 10.

[0032] A dynamometer can accurately and continuously (or at a high sampling rate) acquire the rotational speed signal of a motor rotor. It can acquire the instantaneous rotational speed signal of the motor rotor under dynamic conditions by accurately marking the start point (key phase signal) of each rotation cycle, making the subsequent signal processing results more accurate.

[0033] The instantaneous radial runout displacement signal of the motor rotor and the speed signal of the motor rotor acquired by the laser displacement sensor must be ensured to have precise timestamp synchronization.

[0034] The data preprocessing steps include ensuring that the speed and displacement signals are perfectly aligned in time; applying a low-pass filter to remove noise much higher than the highest frequency of interest (such as the frequency of the highest analysis order), and applying a high-pass filter to remove extremely low-frequency drift; removing the DC bias to calculate the average value of the displacement signal and subtracting it, so that the signal fluctuates around the zero line; and identifying and removing or correcting abnormal spike interference.

[0035] In some embodiments, the instantaneous radial runout displacement signal of the motor rotor acquired by the laser displacement sensor and the instantaneous speed signal of the motor rotor under dynamic conditions acquired by the dynamometer are processed using MATLAB's data processing function. The order spectrum of the motor rotor angle domain signal is plotted using MATLAB's plotting function, and the fitting curve of the motor's dynamic radial runout displacement as a function of speed is plotted with the preprocessed instantaneous speed signal of the motor rotor.

[0036] In some technical solutions, the method of resampling the preprocessed instantaneous rotor speed signal in the angle domain to obtain the angle domain signal corresponding to the instantaneous rotor speed signal includes: calculating the instantaneous angle signal corresponding to the instantaneous rotor speed signal. θ(t) =∫2π×RPM(t) / 60dt; Where θ(t) is the instantaneous angle signal corresponding to the instantaneous rotational speed signal of the motor rotor, and RPM(t) is the instantaneous rotational speed signal of the motor rotor.

[0037] The aim is to convert displacement signals sampled at equal time intervals into signals sampled at equal angular intervals. This eliminates the influence of speed fluctuations, allowing spectral analysis to directly reflect components related to the speed order. Differentiating the instantaneous rotor speed yields the instantaneous angular velocity corresponding to that speed. Integrating this angular velocity gives the angle rotated by the rotor. This correlation aims to link the radial runout displacement of the rotor with the angle rotated, converting discrete-time sampled radial runout data into radial runout data that continuously varies with the rotation angle. The rotor's trajectory waveform at that speed can then be fitted based on the angle-radial runout.

[0038] In some technical solutions, the instantaneous angle signal θ(t) corresponding to the instantaneous rotational speed signal of the motor rotor is interpolated. Simultaneously, the instantaneous angle signal θ(t) is aligned with the timestamps of the instantaneous radial runout displacement signals of the motor rotor collected by multiple laser displacement sensors, resulting in angle domain signals d(θ) corresponding to multiple instantaneous rotational speed signals of the motor rotor. In some embodiments, when the number of laser displacement sensors is 6, aligning the instantaneous angle signal θ(t) corresponding to the instantaneous rotational speed signal of the motor rotor with the timestamps of the instantaneous radial runout displacement signals of the motor rotor collected by the 6 laser displacement sensors yields 6 angle domain signals d(θ), which map the correspondence between the instantaneous angle and the instantaneous radial runout displacement of the motor rotor.

[0039] The instantaneous angle signal corresponding to the instantaneous rotor speed signal is calculated, and interpolation processing is performed on the instantaneous angle signal θ(t) to obtain the angle domain signal d(θ) corresponding to the instantaneous rotor speed signal. The angle domain signal d(θ) reflects the relationship between the rotor rotation angle and the radial displacement. The purpose is to convert the displacement signal sampled at equal time intervals into a signal sampled at equal angular intervals. This eliminates the influence of speed fluctuations, allowing the spectrum analysis to directly reflect the components related to the speed order.

[0040] Since the sampling rate of the instantaneous speed signal of the motor rotor cannot be infinitely high, there will be sampling period breakpoints in the actual data acquisition process. By resampling, equally spaced data points are obtained in the angle domain. The interpolation processing methods include cubic spline interpolation, B-spline interpolation, Hermite spline interpolation, and other difference methods, which are used to smooth the sub-instantaneous speed data with sampling period breakpoints.

[0041] In some technical solutions, the method of calculating the order spectrum of the angle domain signal based on the angle domain signal corresponding to the instantaneous rotational speed signal of the motor rotor to obtain the order spectrum of the motor rotor angle domain signal includes: performing Fourier transform on the angle domain signals d(θ) corresponding to multiple instantaneous rotational speed signals of the motor rotor respectively to obtain multiple radial displacement order spectra with the order as the horizontal axis and the amplitude of the radial displacement of the motor rotor as the vertical axis, and vector superimposing the complex numbers of the same order to obtain the radial displacement order spectrum of the motor rotor.

[0042] The order spectrum obtained by performing a Fourier transform on the angular domain signal d(θ) can avoid the influence of unstable speed changes on the measurement of rotor radial runout. Regardless of the speed change, the vibration order caused by the rotor itself remains constant. The radial displacement order spectrum of the motor rotor is obtained by vector superposition of complex numbers of the same order. If a certain vibration component (such as 1X vibration caused by imbalance) is coherent in all sensor signals (i.e., has a fixed phase relationship), then during vector summation, these vibration components will be superimposed in phase, increasing their amplitude. For unrelated random noise or local interference, due to the random phase, they will partially cancel each other out during summation. The true fault characteristics will be more prominent and acute in the final order spectrum, making them easier to identify and quantify.

[0043] In some embodiments, the angle domain signal d(θ) corresponding to the instantaneous rotor speed signal is processed by the data processing software installed on the computer system, automatically converting the time domain signal into a frequency domain signal to obtain the relevant order data. The horizontal axis represents the order (Order = vibration frequency / rotational frequency) (representing the harmonic order of the vibration component relative to the rotational speed), with dimensionless units; the vertical axis represents the amplitude (or energy density) of the radial displacement (reflecting the distribution of vibration intensity across orders), with units the same as the displacement signal (mm, μm). In the order spectrum, order 1 (1X) = 1 vibration per revolution; order 2 (2X) = 2 vibrations per revolution; order 0.5 (0.5X) = 1 vibration every two revolutions. On the order spectrum, the amplitude and phase corresponding to order 1 (1X) are the main synchronous vibration components of the rotor's dynamic radial runout at that speed (usually representing the unbalanced response). The amplitude represents the magnitude of the rotor's radial runout, and the phase represents the unbalanced angular position relative to the key phase mark. Similarly, synchronous vibration components such as 2X and 3X can be extracted. Asynchronous vibration components are the non-integer parts of the order spectrum (such as 0.42X, 1.78X).

[0044] In some technical solutions, the method of plotting the fitting curve of the dynamic radial runout displacement of the motor as a function of the rotational speed based on the order spectrum of the motor rotor angle domain signal and the preprocessed instantaneous speed signal of the motor rotor includes: extracting the synchronous vibration component of the order spectrum of the motor rotor angle domain signal, plotting the fitting curve of the dynamic radial runout displacement of the motor as a function of the rotational speed with the instantaneous speed or frequency of the motor as the abscissa and the amplitude or phase of the synchronous vibration component of the order spectrum of the angle domain signal as the ordinate.

[0045] The fitted curves are plotted with rotational speed (or rotational frequency) on the x-axis, showing the changes in 1X amplitude and 1X phase as a function of rotational speed. This is the fitting result of the dynamic radial runout (mainly referring to the 1X synchronization component) as a function of rotational speed.

[0046] If the data is collected at a stable rotational speed, then the amplitude and phase of the 1X order in the order spectrum are the fitting results of the dynamic radial runout at that rotational speed (usually represented by the complex form `A * e^(jφ)`).

[0047] If the data is repeatedly resampled in the angle domain and the order spectrum is calculated at a series of rotational speed points (or a narrow rotational speed window), then it is necessary to extract the 1X order amplitude and phase corresponding to each rotational speed point in the order spectrum as the dynamic radial runout fitting result.

[0048] Based on the dynamic radial runout fitting results, curves showing the change of synchronous vibration component amplitude and synchronous vibration component phase with rotational speed can be plotted as fitting curves of the motor's dynamic radial runout displacement with rotational speed.

[0049] Based on the dynamic radial runout fitting results, fitting curves of the synchronous vibration component amplitude and synchronous vibration component phase as a function of rotational speed can be plotted. Further plotting and analysis yield the following results: like Figure 5 The cascaded plot (waterfall plot) shown is formed by stacking the order spectra of all rotational speed points. The trajectory (amplitude and phase) of the 1X component as a function of rotational speed is clearly visible. X-axis (Order [X]): Represents the ratio of vibration frequency to rotational frequency. 1X represents vibration at the same frequency as the rotational speed (mainly caused by mass imbalance), 2X represents vibration occurring twice per rotation (possibly caused by alignment), and so on. Y-axis (RPM): Represents the speed range of the rotor, from 0 RPM to 5000 RPM, covering the motor's start-up (speed increase), steady-state operation, and shutdown (speed decrease) processes. Z-axis (color and amplitude; μm): The amplitude of radial runout is represented by the brightness of the color (from blue to yellow) and the color bar on the right. The brighter the yellow, the greater the vibration amplitude at that speed and order, and the more prominent the vibration problem. In addition to focusing on the trajectory of the 1X component, cascade diagrams can also analyze the trajectories of other orders (such as 2X which may indicate misalignment) and asynchronous components (such as 12X / 24X which may indicate electromagnetic force) to gain a comprehensive understanding of the source of the fluctuation.

[0050] like Figure 4 The polar plot shown, which plots the 1X components (amplitude and phase) at each rotational speed point on a polar graph (Nyquist plot), is a classic way to observe critical speeds and balance responses. The amplitude is the radial distance, and the phase is the angle. Each point on the plot represents the instantaneous state of the radial runout vector (1X component) during one revolution of the rotor at 3000 RPM. The radial distance (distance to the origin) represents the amplitude of the radial runout (unit: micrometers or millimeters). The farther from the center, the greater the amplitude of the vibration. Angular position: represents the phase angle (unit: degrees) of the runout vector relative to the keyphasor. For example, 180° indicates that the unbalanced mass point is located exactly in the opposite direction to the keyphasor.

[0051] like Figure 3 The Bode plots shown are used to plot the 1X amplitude-speed curve and the 1X phase-speed curve, respectively, reflecting the variation of the 1X amplitude-speed curve and the 1X phase-speed curve with the speed. Figure 3The upper part (blue curve) shows how the 1X order vibration amplitude (in μm) changes with rotational speed (RPM). The curve exhibits a distinct peak. The amplitude reaches its maximum value (close to 50 μm) near 3000 RPM, indicating that 3000 RPM is the first-order critical speed of this rotor system. When the rotor operates at speeds close to this, the system resonates, and the vibration response excited by unbalanced forces is amplified dramatically. This is a dangerous speed range that must be avoided or quickly traversed during operation. Figure 3 The lower half (red curve) shows how the phase (in degrees) of the 1X order vibration signal changes with rotational speed (RPM). Phase refers to the hysteresis angle of the vibration peak relative to the keyphasor. The phase curve shows a sharp jump of nearly 90° near 3000 RPM. This rapid phase change is a decisive indicator that the system has passed the critical rotational speed (resonance point), further validating... Figure 3 The upper half (blue curve) has a peak amplitude corresponding to the speed of the critical speed.

[0052] like Figure 6 The axis center trajectory diagram shown illustrates that, for multiple uniformly distributed laser displacement sensors, the measured values ​​of multiple laser displacement sensors (4) can be fitted by angle to synthesize the planar motion trajectory (axis center trajectory) of the rotor center. After resampling in the angle domain, the synchronous trajectory (the trajectory after filtering out non-synchronous components) can be extracted. The closed curve in the figure depicts the motion path of the rotor axis center within one or more complete rotation cycles. The X-axis and Y-axis in the figure represent the radial displacement measured by two mutually perpendicular laser displacement sensors (in micrometers or millimeters). The origin (0,0) represents the theoretical rotation center or average position of the rotor.

[0053] If there are multiple measurement sections along the rotor axis, the data for each section needs to be analyzed as described above, and modal analysis or balance calculations need to be performed.

[0054] Example 3 The present invention provides a computer-readable storage medium storing a computer program, which, when executed by a processor, performs the steps of the method described in Embodiment 2.

[0055] This invention can be implemented in whole or in part by software, hardware, firmware, or any combination thereof. When implemented in software, it can be implemented in whole or in part as a computer program product. The computer program product includes one or more computer instructions. When the computer program instructions are loaded and executed on a computer, all or part of the processes or functions described in the embodiments of this invention are generated. The computer can be a general-purpose computer, a special-purpose computer, a computer network, or other programmable device. The computer instructions can be stored in a computer-readable storage medium or transmitted from one computer-readable storage medium to another. For example, the computer instructions can be transmitted from one website, computer, server, or data center to another website, computer, server, or data center via wired (e.g., coaxial cable, fiber optic, digital subscriber line (DSL)) or wireless (e.g., infrared, wireless, microwave, etc.) means. The computer-readable storage medium can be any available medium that a computer can access or a data storage device such as a server or data center that integrates one or more available media. The available medium can be a magnetic medium (e.g., floppy disk, hard disk, magnetic tape), an optical medium (e.g., DVD), or a semiconductor medium (e.g., a solid-state drive (SSD)).

[0056] It will be readily understood by those skilled in the art that the above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, combinations, substitutions, improvements, etc., made under the spirit and principles of the present invention are included within the protection scope of the present invention.

[0057] The contents not described in detail in this specification are existing technologies known to those skilled in the art.

Claims

1. A dynamic rotor radial runout amount testing device characterized by, The utility model relates to a motor rotor dynamic radial runout test device and a motor rotor dynamic radial runout test method, and the motor rotor dynamic radial runout test device comprises a base (1), a test tool support (2) arranged on the base (1), a support tool (5), a dynamometer (6), a laser displacement sensor (4) mounted on the test tool support (2), and the dynamometer (6) is connected with the motor rotor (3) through the support tool (5). The lower end of the test tool support (2) is a supporting part, and the upper end is a circular frame provided with a cavity; the test tool support (2) moves along the axial direction of the motor rotor (3) through a moving groove (8).

2. A dynamic rotor radial runout amount testing device according to claim 1, characterized by: The laser displacement sensor (4) is provided in plurality, and the plurality of laser displacement sensors (4) are uniformly and symmetrically distributed along the hollow circular frame at the upper end of the test tool support (2).

3. A dynamic rotor radial runout amount testing device according to claim 2, characterized by: The support tool (5) comprises a supporting part (5.1) and a connecting part (5.2), the supporting part (5.1) and the connecting part (5.2) are connected through a butt joint, and the dynamometer (6) is connected with the motor rotor (3) through a spline shaft penetrating through the supporting part (5.1) and the connecting part (5.2).

4. A dynamic rotor radial runout amount testing device according to claim 3, characterized by: The dynamometer (6) is connected with the base (1) through a dynamometer support (7).

5. A dynamic rotor radial runout amount testing device according to claim 4, characterized by: The motor rotor is driven to rotate by using the dynamometer, and the motor rotor instantaneous radial runout displacement signals of the motor rotor under dynamic state are collected through the plurality of laser displacement sensors; the instantaneous speed signals of the motor rotor under dynamic state are collected by the dynamometer; 6. A method for testing dynamic rotor radial run-out of a device as claimed in claim 1, characterized in that, The preprocessed motor rotor instantaneous speed signals are angle domain resampled to obtain the angle domain signals corresponding to the motor rotor instantaneous speed signals; the order spectrum of the angle domain signals is calculated according to the angle domain signals corresponding to the motor rotor instantaneous speed signals; the order spectrum of the motor rotor angle domain signals is obtained; and the fitting curve of the motor dynamic radial runout displacement changing with the speed is drawn according to the order spectrum of the motor rotor angle domain signals and the preprocessed motor rotor instantaneous speed signals. The method for performing angle domain resampling on the preprocessed motor rotor instantaneous speed signals to obtain the angle domain signals corresponding to the motor rotor instantaneous speed signals comprises the following steps: calculating the instantaneous angle signals corresponding to the motor rotor instantaneous speed signals: θ (t) = ∫2pi x RPM (t) / 60dt; 7. The method of claim 6, wherein: wherein θ (t) is the instantaneous angle signal corresponding to the motor rotor instantaneous speed signals, and RPM (t) is the instantaneous speed signal of the motor rotor. The interpolation processing is performed on the instantaneous angle signals θ (t) corresponding to the motor rotor instantaneous speed signals, and the instantaneous angle signals θ (t) corresponding to the motor rotor instantaneous speed signals are respectively aligned with the time stamps of the motor rotor instantaneous radial runout displacement signals collected by the plurality of laser displacement sensors, so that the angle domain signals d (θ) corresponding to the plurality of motor rotor instantaneous speed signals are obtained. The method for calculating the order spectrum of the angle domain signals according to the angle domain signals corresponding to the motor rotor instantaneous speed signals to obtain the order spectrum of the motor rotor angle domain signals comprises the following steps: performing Fourier transform on the angle domain signals d (θ) corresponding to the plurality of motor rotor instantaneous speed signals respectively to obtain the radial displacement order spectrum with the horizontal coordinate being the order and the vertical coordinate being the amplitude of the motor rotor radial displacement; and performing vector superposition on the complex numbers with the same order to obtain the radial displacement order spectrum of the motor rotor.

8. The method of claim 7, wherein: ​ 9. The method of claim 8, wherein: ​ 10. The method of claim 9, wherein: The method for drawing a fitting curve of dynamic radial jump displacement of a motor varying with rotational speed according to the order spectrum of a motor rotor angle domain signal and the preprocessed instantaneous rotational speed signal of the motor rotor comprises the following steps: extracting a synchronous vibration component of the order spectrum of the motor rotor angle domain signal; taking the instantaneous rotational speed or rotational frequency of the motor as the horizontal coordinate, and taking the amplitude or phase of the synchronous vibration component of the order spectrum of the angle domain signal as the vertical coordinate; and drawing the fitting curve of the dynamic radial jump displacement of the motor varying with the rotational speed.

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